Calculate the circumference of a circle whose radius is 2.5.
We take Pi equal to 3, that is, pi = 3.
The circumference is calculated by the formula c = 2 * pi * r, where c is the circumference.
Substitute the known values into the formula and calculate its value.
c = 2 * 3 * 2.5 = 2 * 3 * 5/2 = 2/2 * 3 * 5 = 1 * 3 * 5 = 3 * 5 = 15;
From this we got that the circumference is equal to c = 15.
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